Well it's good he leaves because his been at Chelsea for two seasons now and no improvement from him. Maybe the team doesn't favour him so it's best he leaves. With the players Chelsea have now, if he stays he will just be a bench warmer. This news has mentioned three different clubs, if they see as a possible option for their team then it's good, let him go there, it might actually favour him and they may bring out the best in him.
We dont know which club Nicolas Jackson will join, I think the decision is left for him to make. Clubs like Aston Villa, Newcastle, Bayern Munich are all interested but if I should suggest, I feel going to Bayern Munich will be the best move. Staying at Newcastle will make him second option he will also be a bench warmer over there if he goes there, and Aston Villa will also be a good fit.